It is essential that we _______ measures to protect the ozone layer.

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问题 It is essential that we _______ measures to protect the ozone layer.

选项 A、will take
B、should take
C、would take
D、took

答案B

解析 本题测试虚拟语气。在“It is/was+某些形容词”后的that从句中,常用“(should)+动词原形”构成虚拟语气(should可以省略),表示建议、惊奇等。这些形容词包括 important,necessary,essential,urgent,natural,strange,advisable,desirable,probable, amazing,surprising,desired,suggested,required,proposed,decided等。本句大意:要紧的是,我们应该采取措施保护臭氧层了。
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